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| title | media type | ISBN-13 | year of publica- tion | other author(s) | |
|---|---|---|---|---|---|
| Beaver Towers | Paperback | 978-0-14-037060-7 | 1995 | ||
| Beaver Towers: The Dangerous Journey | " | 978-0-14-038388-1 | 1997 | ||
| Beaver Towers: The Dark Dream | " | 978-0-14-038389-8 | 1997 | ||
| Beaver Towers: The Witch's Revenge: Witches Revenge | " | 978-0-14-037061-4 | 1995 | ||
| Buddy | " | 978-0-14-131920-9 | 2005 | ||
| Buddy | " | 978-0-14-037176-5 | 2003 | ||
| Buddy | Hardcover | 978-0-435-12275-1 | 1983 | ||
| Buddy's Song | " | 978-0-435-12338-3 | 1989 | ||
| Collision Course | Paperback | 978-1-903015-42-1 | 2004 | ||
| Im Herzen des Tals | Taschenbuch | 978-3-423-62080-2 | 2001 | ||
| Im Herzen des Tals. Brigitte-Edition Band 4 | Gebundene Ausgabe | 978-3-570-19514-7 | 2005 | Hilde Linnert | |
| The Finders | Paperback | 978-0-14-036239-8 | 1994 | ||
| The Heart of the Valley | " | 978-0-89733-360-3 | 1992 | ||
| The Heart of the Valley | Hardcover | 978-0-06-015655-8 | 1986 | ||
| Time Bomb | Paperback | 978-0-14-131833-2 | 2005 | ||
| Until Proven Guilty | " | 978-1-84299-369-9 | 2006 | ||